diff --git a/README.md b/README.md
index 5f4527e..d7bcb8f 100644
--- a/README.md
+++ b/README.md
@@ -138,8 +138,9 @@ gherkingen -help
 
 ## Go
 
-```
+```bash
 go install github.com/hedhyw/gherkingen/v2/cmd/gherkingen@latest
+# Notice: gherkingen -version will return "unknown" version.
 ```
 
 ## Source
diff --git a/pkg/bdd/bdd.go b/pkg/bdd/bdd.go
index 3d6b12b..cb85278 100644
--- a/pkg/bdd/bdd.go
+++ b/pkg/bdd/bdd.go
@@ -106,6 +106,8 @@ func (f *Feature) subBlock(name string, fn func(t *testing.T, f *Feature)) {
 }
 
 // Background defines a background block.
+//
+// Notice: Background is not running for each step.
 func (f *Feature) Background(name string, fn func(t *testing.T, f *Feature)) {
 	f.T.Helper()